Fable 5.2 and Mythos 5.2 performed as well as, or better than, our recent models on most alignment measures.
The model was also tested before release by external evaluators, including the @AISecurityInst, @FrontierDesign2, and @METR_Evals.
Anthropic says Fable 5.2 and Mythos 5.2 match or beat recent models on alignment
AIAnthropic says Fable 5.2 and Mythos 5.2 performed as well as or better than its recent models on most alignment measures. External evaluators, including AISecurityInst, FrontierDesign2, and METR, tested both models before release.
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Original title: Fable 5.2 and Mythos 5.2 performed as well as, or better than, our recent models on most alignment measures.